Recent findings suggest the machines -- sometimes called "DRE" machines for Direct Recording Electronic -- are prone to hacking, critics say. Tampering is hard to detect because companies making the machines are secretive about how they work, add the critics. They prefer a more retro technology: Paper and ink. Touch screen systems should spit out paper backups, so voters can verify on the spot if their votes were recorded properly, some contend. These paper tallies would be stored by election officials, to match against electronic results for recounts. Rep. Rush Holt (D-12th Dist.), a physicist, is pushing a bill to...